character encoding

(character)(Or "character encoding scheme") A mapping ofbinary values to code positions and back; generally a 1:1(bijective) mapping.

In the case of ASCII, this is generally a f(x)=x mapping:code point 65 maps to the byte value 65, and vice versa. Thisis possible because ASCII uses only code positionsrepresentable as single bytes, i.e., values between 0 and 255,at most. (US-ASCII only uses values 0 to 127, in fact.)

Unicode and many CJK coded character sets use many morethan 255 positions, requiring more complex mappings: sometimesthe characters are mapped onto pairs of bytes (see DBCS).In many cases, this breaks programs that assume a one-to-onemapping of bytes to characters, and so, for example, treat anyoccurrance of the byte value 13 as a carriage return. Toavoid this problem, character encodings such as UTF-8 weredevised.

单词	character encoding
释义	character encoding character encoding n. Any of various encoding schemes, such as ASCII or Unicode, in which letters and other characters are each assigned a unique number for storage and transmission on computers. Also called character map, character set, charset. character encoding character encoding (character)(Or "character encoding scheme") A mapping ofbinary values to code positions and back; generally a 1:1(bijective) mapping. In the case of ASCII, this is generally a f(x)=x mapping:code point 65 maps to the byte value 65, and vice versa. Thisis possible because ASCII uses only code positionsrepresentable as single bytes, i.e., values between 0 and 255,at most. (US-ASCII only uses values 0 to 127, in fact.) Unicode and many CJK coded character sets use many morethan 255 positions, requiring more complex mappings: sometimesthe characters are mapped onto pairs of bytes (see DBCS).In many cases, this breaks programs that assume a one-to-onemapping of bytes to characters, and so, for example, treat anyoccurrance of the byte value 13 as a carriage return. Toavoid this problem, character encodings such as UTF-8 weredevised. ThesaurusSeecharacter set
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